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    • 4. 发明授权
    • NTSC interference detector
    • NTSC干扰检测器
    • US5546132A
    • 1996-08-13
    • US351581
    • 1994-12-07
    • Kyeong S. KimJong K. Kim
    • Kyeong S. KimJong K. Kim
    • H04N7/015H04N5/21H04N5/44H04N7/08H04N7/00
    • H04N7/0803H04N5/21H04N5/4401
    • An NTSC interference detector is disclosed which includes an NTSC extracting filter for extracting an NTSC signal component from a received I-channel signal; a comparing portion for integrating the NTSC signal output from the NTSC extracting filter for a predetermined period and deciding whether the NTSC signal component is above a first reference value or not; and a control signal generator for adding the signal output from the comparing portion for every horizontal sync, deciding the presence or absence of NTSC interference according to a second reference value, and outputting a control signal according to the presence or absence of NTSC interference, thereby accomplishing a precise detection of NTSC interference.
    • 公开了一种NTSC干扰检测器,其包括用于从接收的I信道信号中提取NTSC信号分量的NTSC提取滤波器; 比较部分,用于在预定时间段内对从NTSC提取滤波器输出的NTSC信号进行积分,并确定NTSC信号分量是否高于第一参考值; 以及控制信号发生器,用于将每个水平同步的比较部分输出的信号相加,根据第二参考值确定NTSC干扰的存在或不存在,并根据是否存在NTSC干扰输出控制信号,从而 完成NTSC干扰的精确检测。